<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>组件使用中的细节点</title>
    <script src="./vue.js"></script>
</head>
<body>

<div id="root">
    <counter ref="one" @change="handleChange"></counter>
    <counter ref="two" @change="handleChange"></counter>
    <div>{{total}}</div>
</div>

<script>

    Vue.component('counter',{
        template: '<div @click="handleClick">{{ number }}</div>',
        data: function(){
            return {
                number: 0
            }
        },
        methods: {
            handleClick: function () {
                this.number ++
                this.$emit('change')
            }
        }
    })

    var vm =new Vue({
        el: "#root",
        data: {
            total: 0
        },
        methods: {
            handleChange: function () {
                this.total= this.$refs.one.number + this.$refs.two.number
                console.log(this.$refs.one.number)
                console.log(this.$refs.two.number)
            }
        }
    })
</script>
</body>
</html>